Blow-Out Preventers (BOP) Stack
The main constituents of BOP equipment are Annular BOP, Stack BOP, Gate Valves, Ram door opener and a Working platform for easy access and maintenance of BOP. The Operating pressure of BOP varies from 3000PSI to 15000PSI depending upon the requirements. The function of BOP during the drilling operation is to control the sudden surge in well pressure or massive kick-out, through a hydraulically operated ram to close the well with or without drill pipe. It facilitates change of drill pipe even under moderate well pressure. BOP stakes is also equipped with choke and kill manifold to send the Drilling fluid (mud) to well in case of kick. Thus, the BOP controls all phases of drilling operations effectively through, hydraulically, remote controlled panels in the Rig/barge.
A typical BOP stack with Platform
BOP access platforms
BOP platforms are built around the stack to facilitate easy access to BOP Stack for repair and maintenance as shown in the picture.
CES has carried out BOP platform modifications, retrofits, additional facilities for various drill rigs and barges.
Drilling deck, where drilling operation performed, is mounted on hull structure with the aid of movable cantilever beams directly below derrick. It houses various associated equipment/machinery, such as, draw works, rotary table, Kelly drive, drill line, drill string and derrick with drill pipe stand. Below the drill floor flow line is located through bell nipple to facilitate the return of drilling fluid (mud) to mud tanks.
CES has also carried out modification in moon pool area to accommodate foldable BOP storage area, cellar deck, pathways, mud lab etc.
Helideck is an integral part of the main structure of barges, jack-ups and semi-submergible to facilitate smooth transport of men and materials from main land. Helidecks are either mounted outboard with cantilever support or above the accommodation block and located mainly on the AFT side
Thus, this vital support system of all offshore operation is positioned in such a way to enable easy access in landing and departing of helicopters. Helideck is used as a primary escape route for the personnel to move away from hazards in case of emergencies. The helideck includes fire protection system, fueling systems, navigation aids, lighting, emergency alarms and public address systems.
All modern drill rigs are provided with a rescue boat, apart from inflatable boats, which can be operated through winches to lower the personnel from deck in case of emergencies to getaway as far as away from site. The rescue boat shelter is built near the accommodation block on a cantilever beam structure, with access ways and crew assembly area, in such a way that the boats can be lowered to sea water directly.
CES has carried out helideck and rescue boat structure modifications, retrofits, additional safety facilities for various drill rigs and barges.
Cranes play important role in drilling operation of rigs/barges efficiently. Cranes are oriented in the barges/drill rigs at AFT-STBD and AFT-PORT side of the with boom length of 30 to 40m and safe lifting capacity from 30000kgs to 50000kgs.
CES has carried out Crane modifications, retrofits, additional safety facilities for various drill rigs and barges.